Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef9d427f17a0498…

MALICIOUS

PDF

78.9 KB Created: 2021-09-13 03:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24ce2010c70bafee4e2309c5f4690067 SHA-1: c34d44f479225ffc09d16a0ed61b59cc33d80e36 SHA-256: 0ef9d427f17a0498616a2611448278778ce4dba0155b7c4705a925ecf85598e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a high concentration of links on disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ntct.dz/ckfinder/userfiles/files/10854935876.pdf In PDF document text
    • https://novamakine.com/upload/ckfinder/files/kegodosewuzo.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/gojowi.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79a5114a9---24366413741.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/xobatusajugud.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/povifa.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/70776068971.pdfIn PDF document text
    • http://idcla.net/upload/files/84977046447.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/15267840046.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138273a3a944---tukedogikove.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/3442743020.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/75519051598.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/19334366650.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/34615773342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+save+a+voicemail+on+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 18096 bytes
SHA-256: 03bab97df7db0aa7697c5f636fa4f81b5eaa2188b832a6be88a77ebf6ccc295e
font_02_sfnt_off00011651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11651 10672 bytes
SHA-256: 2d8aa19644a618113d2240e78e38de329553f5f2b833145a1839df971e664a42

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